Switching system



April 7,7-1931. E. E. JAcoBlT-rl SWITCHING SYSTEM Filed June 4, 1927 QS@ I Patented Apr. 7, 1931 lUNITED STATES PATENT', OFFICE EDWARD E. JACOBITTI, OF NEWARK,` NEW JERSEY, ASSIGNOR TOWESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A CORPORATION OF NEW YORK y swI'rcHING SYSTEM Application led J'une 4, 1927. Serial No. 196,470.

telephone circuits are rotated by energizing magnets, associated with said switches, through the switch contacts. Where coordination of switch movement is required for a plurality of switches many of the switch contacts are ordinarily used for the control of the associated switches. For the sake of economy it is desirable to use the contacts of each switching position. fIn order to control a switch for movement fromone position to the neXt when successive positional contacts are used for such control it isnecessary to open the magnet energizing circuit as soon as the switch has rotated out of the position in which it has been resting. It this energizing circuit is not opened quickly the magnet energizing circuit would remain established when the switch arrived in its next position. This would cause the switch to again rotate to a subsequent position orcontinue to rotate through its entire cycle.

A specific embodiment of the present invention comprises a set or pair of counting relays placed under the control of the contacts of two switches. The rotating magnets 0 of the switches are in turn placed under the control of the pair of'counting relays. Certain of the contacts of the two switches are matched to operate the counting relays. One counting relay is operated to rotateone of the switches to the next or a subsequent posiiional contact. The second counting relay is Yheld Vinoperative until this switch has moved a portion of the rotation on its way to-the next'or subsequent Contact position.

A/ The 'operation of the second counting relay arrests the movement of the switch rotated by the operation of the first counting relay. The second counting relay further establishes a circuit to energize the magnet of the second switch to cause its rotation. This second switch through its contacts, as matched withthe contact of the rst switch, has contributed to the control of the counting relays and the movement of the switches as hereinbefore described. The movement of the second switch under the control of the second countin relay disestablishes all control circuits. he counting relays are thus released. This same movement of the switches takes place `whenever the control circuits of the switches are matched for operating the counting relays.` Y y In accordance with the present invention the two switches may be matchedl in any desired combinations. One of the switches may be arrested to establish circuits fromeach switching position. A second switch may have only one of a vplurality of positional contacts matched with each position of the first switch.` When such a combination of switch contacts is used the first switch will be arrested in each position and the second switch willmake a complete revolution'for each single movement of the first switch. Coordination of switch movement such, as herein disclosed isv of considerable value in circuit arrangements such as disclosed in Figs. 5 and 6 of Patent v1,573,413 issued to H. W; MacDougall, February 16, 1926. In the arrangement shown in this patent it will be noted that the contacts in alternate sequence switch positions are used entirely for controlling the movement of cooperating sequence switches. In this method of controlling the coordinate movement of two switches the number of sequence switch positions used only for control purposes are equal to the number of stops to be made by the sequence switches. This arrangement of control is satisfactory for circuits wherein the sequence switch position contacts are not required for other purposes. When each position of the sequence switch is required for circuit changes other than sequence switch control, it is obvious that a diiferent method of controlling the movement of the switches is required. The use of a pair of counting relays according to the present invention thus makes possible the use of the sequence switch contacts otherwise necessary for controlling position changes. In controlling the movement of one switch in single steps through the contacts of a second switch some intermediate agency must be employed toprevent the continuous movement of the switch under control if the same circuit is always'used for changing the position of the sequence switch. In the present invention counting relays are used for this intermediate agency which are progressively operated. to progressively move the respective switches. If' more than one circuit is employed for changing the position of the switches, more apparatus than a pair of counting relays would be. required for the intermediate agency. The use of the counting relays as shown thus serves to economize in theamount of apparatus necessary for controlling the coordinate movement oi two switches.

This counting relay control circuit may beused for controlling the progressive and alternate movement of two switches from position to position throughout a complete cycle of each switch. The synchronous movement of the two switches may be arrested in any position of the switches by the use of auxiliary apparatus and circuits represented by the keys illustrated. Other positional matching arrangements may be used with this control system in order to rotate the switches through numerous switching positions only stopping to establish control cir# cuits at particular single positions" throughout the switch cycle.l p t Not only is there a saving in switch contacts but in the number` of relays necessary for moving one or a plurality of switches in single successive steps or in any manner of moving such switches in which singley successive steps are included lin the cycle of movement. In accordance' with the present invention the switch movementv may be altered by the op.- eration ot keys, which isv4 very kdesirable in many* circuits. In testing systems similar to the oner disclosed in the aforementioned patent to MacDougall, a maximumnumber of different tests are included. Some' of these tests are more important than others and should be made more often, By eliminating parto"v the tests much timeis saved in testing the circuits of a telephone oirice. YThe switch contacts may be arranged according to the disclosure for association* with control circuits through key contacts for altering the period of operation of one 'or both relays for causing the'switches to move through several contact/ positions whiclrmay be known in some circuits as testing positions or control positions. The utility of synchronously moving switches'for providing alarger number of' control circuits than can be provided on one switch or forsignalling circuits used in telephone and telegraph practice is well known. The present invention thus provides l' a simplified circuit and apparatus arrangement for diversified switching operations in which coordination of switch movement is required.

The illustrated `embodiment indicates two switches. These switches are shown in the form of the well known sequence switch used in machine switching telephone circuits. Such a switch is disclosed in the patent to J.v N. Reynolds and C. VF. Baldwin No. 1,127,808 granted February 9," 1915. The contacts, shown immediately above the driving magnets 101 and 201 of switches S-100 and S-200, are arranged to be open in each of the switch positions indicated by the numerals 1, 2, etc. applied thereto, but are closed when the corresponding switch is advancing between the posit-ions indicated byv such numerals to insure that such switch willadvance into its next stopping position even though the circuit over which the switch is being advanced be. open at another point. The remaining contacts closed by each switch, for example, contacts 102,* 103, 104, 105, 106, 107', r108, 109 and 112 are closed only in the positions. indicated by the numerals applied to such contacts. For example, contact 103 is' closed in positions 2- to 4 inclusive, 6, 7, 8 to 12 inclusive, 13, 14, 15, 16, 1,7 and 18. The circuit arrangement inaccOrdance with this invention is, however, adaptable for con-` trolling many types, of switches and'tgherefore should not be limited to the type of switch disclosed in this embodiment. The counting relays in the form shown are well known in telephone practice. Keys are shown only to illustrate the various matching Contact arrangements that can be usedv for the control of the switches. The invention will be more clearly understood from consideration of the following description taken together with the attached drawing.

Let it be assumed that, all of the keys are normal, and thatI switches S100 and S200 are each in position 1. `Key K1 is momentarily operated to establish a circuit for moving the switch S100 out of position 1. The circuit may be traced from ground through contact of key K1, switch contact 102, switch magnet 101 to battery. The switch S100 is then' driven from position to position by the operation of any type ot'- apparatus in which the invention might be embodied for associating ground with conductor`111, through contact 109, to

batteryk through they switch magnet 101. The,

progressive movement of. switch S100 is arrested in position 18. With switch S-200 in position 1 as switch S-100 advances through a cycle of positions, various control circuits may be established from ground over contact 204 and contacts 107 closed in the indicated positions. These control circuits may be established for making various tests as disclosed in the patent to H. W. MacDougall herein before referred to.

A circuit is now established to rotate the switch S200 under the control of switch S100 to establish new control conditions found in position 2 of switch S200. This circuitmay be traced from ground through contact 104, normal contact of keys K2 and K3, switch contact 203, normal contacts of key K-5, upper normal contact of relay CB2, winding of relay CB1 to battery. Relay CB1 operates and establishes a circuit to energize switch magnet 201. This circuit may be traced from ground through contact 104, normal contacts of keys K2 and K3, lower contact of relay CB1, lower normal contact of relay CB2, contact 205, to battery through the winding of magnet 201. It will be noted that the foregoing circuit was traced through the normal contact of relay CB2. This relay remains inoperative because of a ground shunt around its winding. Ground through the upper contact of relay CB1 is connected to one terminal of the winding of relay CB2 and ground as traced .for operating relay CB1 is connected to the alternate terminal of the winding of relay CB2. The energization of switch magnet 201 rotates the brushes or cams such as 208 from position 1 to position 2.

During, this rotation the circuit established through contact 203 is broken which removes the shunt from the winding of relay CB2. This relay now operates in series with relay CB1. The operation of relay CB2 opens the energizing circuit for magnet 201 for arresting the movement of the switch brushes or cams in position 2. y The operation of relay CB2 further establishes a circuit for energizing magnet 101 to causethe rotation of switch S100 through a second cycle. The energizing circuit for magnet 101 may be traced from battery through its winding, contact 108 in position 18,'upper contact ofrelay CB2, normal contacts of key K5, contact 203 in position 2. normal contacts of keys K3 and K2, contact 104 to ground. When switch S-100 leaves position 18, relays CBJ- 1 and CB-2 release. f

Switch S100 may now complete a second cycle toestablish circuits as controlled through the contacts of position 2 of switch S200, such, for example, as the circuit of contact 206. When the switch S100 again arrives at position 18, circuits will be established as hereinbefore described for the movement of switch S200 from position 2 to position 3. The progressive movement of switch S200 may continue through any number of its switching positions under the control of switch S100 and counting relays CB1 and CB2.

Under some conditions it is desirable to alternately and progressively operate two "5 position. Key K6 is momentarily operated to establish the initial operating circuit for relay CB1. The operation of key K6 also establishes a circuit from ground through contact 105 in position 1, winding of relay 110 to battery through contact 112, for energizing relay 110. This relay locks through contact 105 for associating ground with the winding of relay CB1 until switch S100 moves out of position 1. The operating circuit for relay CB1 may be traced from ground through contact 105, contact of key K6 or relay 110, contact of key K2, contact 203, nor` mal contacts of key K5, upper normal contact of relay CB2, to battery through the winding of relay CB1. Relay CB1 is operated and a shunt path is established for relay CB2 in the manner previously described. The switch magnet 201 is energized through the contact 205, contacts of relays CB2 and CR1 to ground through key K2, contact of relay 110 and Contact 105. Switch S200 now rotates from position 1 to position 2. The circuit for maintaining relay CB2 inoperative is thus removed. The operation of relay CB2 extends the ground previously traced for operating relay CB1, through contact 108 to battery through the switch magnet winding 101. Switch S100 is thus rotated from position 1 to position 2. During the rotation of this switch the holding circuit for relay A110 is opened to cause its release. Relay 110 is released in orderfthat the movement of switch S100 will be arrested when it arrives in position 1 at the end of its cycle. Relays CB1 and CB2 are released during the movement of switch S100 from position 1 to position 2. The switches S100 and S200 now rotate from position to position under control of the contacts of alternate switches and the counting relay CBfl and CB2. 1Vhen the switch S100 is thus rotated through the operation of key K-2 the apparatus for associating ground with conductor 111 is not eiective. In position 2 to 18 of switch S100 the operating circuit for counting relay CB1 is established directly through the switch contact 106.

If keys K6, K-3 and K-5 are operated with the remaining keys normal, then a circuit is established as before described for relay CB-l extending from ground at contact 105, contact of relay 110, the alternate contact of key K-3, contact 207 closed in position 1 of switch S-200, the alternate contact of key K-5, the upper back Contact of relay (3B-2 to battery through the winding of relay CB--1. Relay CB-l operates and locks through the winding of relay CR-2 and establishes a circuit for advancing switch S-200 into position 2 which may be traced from battery through the winding `of magnet 201, contact 205, lower contact of relay CB-2, lower contact of relay CB-l, alternate contact of key K-3, contact of relay 110 to ground at contact 105. As soon as switch S-200 leaves position 1, relay CR-2 operates and closesa circuit for advancing switch S-100 into position 2 extending from batteryr through the winding oi magnet 101, contact 108, front contact of relay CR2,

alternate Contact of key K-, Contact 207,`

altern ate contact to key K-S, contact of relay 110 to ground at Contact 105. As soon as switchS-100 leaves positon 1, relay 110 releases and relays CR 1 and CR-Q release. A new circuit is now established for relay Gliv1 extending from battery through relay CR-1, the upper back contact of relay (iR-2, alternate contact of key K-5, Contact 207, alternate contact to key K-S to ground at, contact 103. Relay CR-1 operates and locks as before described and over its lower contact connects the magnet winding 201 to the circuit just traced to ground atA Contact 103. Since Contact 207 is closed from positions 2 to 4 inlusive, magnet 201 advances switch S--200 into position 5 when Vrelay CR-Q operates and closes a circuit for advancing switch S-100 which extends from battery winding of magnet 101. contact 108,r

front contact of relay Clt- 2, alternate contact of key K-5', contactv 207, alternate contact of keyv K-3 to ground at Contact 103. Since contact 103 is closed from positions 2 tov 4 inclusive,magnet 101 advances switch S-100 into position In this manner switches S-200 and S-100 alternately advance under thev control of contacts 207 and 103.

From the foregoing description, it will be apparent that by the proper manipulation of keys such as K-Q, K-S and K- or equivalent circuit closingapparatus which the keys diagrammatically represent, the two switches may be caused to alternately radvancey in different mannersr whereby rcontrol circuits may besuccessively established for y any apparatus desired such as for establishent to MacDougall.

ing apparatus testing circuits of the character disclosed in the 4hereinbefore cited pat- For example, as previously described, control circuits may be established in each Ystopping position of each switch, as when key'K-Q is operated or established only in certain positions of each switch when keys K-S and'K- are operated as would be the case where it is desired to omit certain tests or certain controlling functions.

Vthat is claimed is 1. In a switching system, a first and a second-multi-positional switch each having a driving magnet, a first and a rsecond relay, means controlled by said first switch for operating said first relay, a circuit controlled by said first relay to operate the magnet of said second switch to advance said second switch from one predetermined position to another, means controlled in the advance of said secvond.switch for roperating said second relay and a circuit controlled by said second relay to operate the magnet of said first switch' to. advance said vfirst switch.

2. In aswitching system, a first and a Vsecond multi-positional switch each having a driving magnet, a first vand second relay, means controlled -in predetermined positions of said first switch for repeatedly operating said first relay, a. circuit controlled by said first relay to operate the `magnet of said second switch to advance saidV second switch successively from position to position, means controlled inthe advance of said second switch for repeatedly operating said second relay and a circuit controlled by said second relay to operate the magnet of said first switch to advance said first switch successively froinposition to position.

3. In a switching system, a first and a second multi-positional switch each having a driving magnet, a first and a second relay,

means controlled in predetermined positions of said first switch 'for repeatedly operating said first relay, a` circuitcontrolled by ysaid first relay tok operate the magnet of said second switch to advance said second switch successively from predetermined position to predetermined position, means controlled in the advance of said second switch for repeatedly operating said second relay and a circuit controlled by said second relay to operate the magnet of said first switch to advance said first switch successively from predetermined position to predetermined position whereby said switches are alternately and similarly advanced. Y

4. In a switching system, a firstY and a second multi-positional switch each having a driving magnet, a first and a second relay, means for closing a starting circuit for the driving magnet of said-first switch, a circuit closed in the movementof' said rst switch for voperating said first relay, a circuit controlled by said first relay to operate the magnet of said second switch to advance said second switch through a predetermined number of positions, means controlled in the advance of said second switch 'for operating said sec-v ond relay and a circuit controlled by said' second relay to` operate the magnet of said fir-st switch to further advance said first switch. f

5. In a switching system, a first and a second multi-positional switch each having a driving magnet, a first and a second relay,`a circuit including the magnet of said first switch for advancing said switchV from position toposition in a first cycle into a pre- Y determined posit-ion, a circuit closed in said predetermined position for operating said first relay, a circuit controlled by said first relay to operate the magnet of said second switch to advance said second switch from one position to a succeeding position, means controlled in the advance of said lsecond,

switch for operating said second relay and a circuit controlled by said second rela to operate the magnet of said first switc to furher advance said first switch in a Second cyc e. 5 6. In a switching system, a first and a second multi-positional switch each having a driving magnet, a first and a second relay, a circuit including the magnet of said first switch for advancing said switch from position to position in a first cycle into a predetermined position, a circuit closed in said predetermined position for operating said first relay, a circuit controlled by said first relay to operate the magnet of said second switch to advance said second switch from one position to a succeeding position, means controlled in the advance of said second switch for operating said second relay and a circuit controlled by said second relay to operate the magnet of said first switch to further advance said first switch from said predetermined position in a second cycle and for releasing said relays, said switches thus advancing alternately under the control of said relays whereby for each cycle of said first switch said second switch is successively advanced from position to position.

7. In a switching system, a first and a second multi-positional switch each having a driving magnet, a first and a second relay, a circuit controlled by said first switch for operating said first relay and for establishing a shunt circuit around said second relay, a circuit established by the operation of said first relay for preparing said second relay for operation and for operating the magnet of said second switch to cause its advance, means controlled by the advance of said second switch for opening said shunt circuit to permit the operation of said second relay, a circuit controlled by said second relay for operating the magnet of said first switch to cause its advance and means controlled by the advance of said switch for releasing said relays and for starting a repetition of the opera-tion of said relays and the advance of said switches.

In wit-ness whereof, I hereunto subscribe my name this 27th day of May, A. D. 1927. EDWARD E. J'ACOBITTI. 

